package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和对应口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO){

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条对应数据
        dishMapper.insert(dish);
        Long dishId = dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null &&flavors.size()>0){
           flavors.forEach(flavor ->
           {flavor.setDishId(dishId);});
        }
        dishFlavorMapper.insertBatch(flavors);

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //select * from dish limit 0,10
        //分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page =dishMapper.pageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        return new PageResult(total,page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //允许一次性批量删除，首先判断当前菜品是否可以删除
        //判断菜品表内找是否存在该菜品，并是否并非起售中 status
        for(Long id : ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //起售中无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断菜品暂时没有被套餐关联中
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds.size()>0&&setmealIds!=null){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中菜品数据
        //for(Long id : ids){
        //dishMapper.deleteById(id);
        //}
        dishMapper.deleteByIds(ids);

        //删除菜品口味表中的关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id寻找菜品及口味
     * @param id
     * @return
     */
    public DishVO getByIdwithFlavor(Long id) {
        //根据菜品id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //封装到VO中
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品及其附属口味
     * @param dishDTO
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品和口味表
        dishMapper.update(dish);

        //口味表删除原有部分，再新增上口味数据
        dishFlavorMapper.deleteByDishId(dish.getId());

        //新增口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null &&flavors.size()>0){
            flavors.forEach(flavor ->
            {flavor.setDishId(dishDTO.getId());});
        }
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     * 根据分类ID查找菜品
     * @param categoryId
     * @return
     */
    public List<DishVO> list(Long categoryId) {
        DishVO dishVO = DishVO.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dishVO);
    }

    /**
     * 修改菜品起售状态
     * @param id
     * @param status
     */
    @Transactional
    public void changeStatus(Long id, Integer status) {
        Dish dish = dishMapper.getById(id);
        dish.setStatus(status);
        dishMapper.changeStatus(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);

        List<DishVO> dishList = dishMapper.list(dishVO);

        for (DishVO d : dishList) {
            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());
            d.setFlavors(flavors);
        }
        return dishList;
    }
}
